Commutator reamer



1,651,286 J. LOCKEN commun'r'on REAMER Filed May 26, 1924 2 Sheets-Sheet l IN VEN TOR Jay/y Lac/(15 ATTORNEYS Nov. 29, 1927 J. LOCKEN COMMUTATOR REAHER Filed May 26, 1924 2 Sheets-Sheet 2 IINVENTOR Java Locks ZOWA ATTORNEYS Panama Nov. 29, 1927.

LFEUNPITEDSTATES JOHN Locxnn, bFCOMSTOGKQ M nnesota.

corrmnvrn'r Application as m 26 ofa simple, compact and unitary structure for clamping the commutator casing carrying the contacts and for reaming-the surface upon which'the usual roller brush for thecomirnitator rides.

A further Object of the invention is' the tlie commutator but for clamping tl' ereamer to said casin in longitudinala'linemerrtwith the axis of-the casing.

This invention will, be bestfunderstood froma consideration of the following detailed description, in View of the accompanying drawingforming a part of the specification; nevertheless it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications which shall define no material departure from the salient features-of the invention as expressed in the appended claim.

In the drawings: 7 V

Figure 1 is aviewin perspective of my improved reamer. a

Figure 2 is a verticalsection taken along the line 22 of Figure 3.

Figure 3 ings, 1 designates a standard or bracket adapted to be secured in any form of convenient socket clamp, or 'visefor supporting the cylindrical clamping member 2-in fixed position. The cylindrical member is split as shown at 3 and is provided with upstanding perforated lugs 4 and 5. The perfora tion of lug 4 is internally threaded to receive the threads of a bolt 6 formed integrally with a perforated head 7 which receives a slidable handle 8 for rotating the head and the screw. The innerend of the cylindrical member is provided with notches 8' adapted to receive the usual nuts and threaded studs- 9 and 10 respectively, forming the binding An object of the invention is the provision isa longitudinal vertical sec-' 1924, serial No. 715,978.

posts which are---connectedwith the spaced" meta larcuately shaped contacts 11 of the commutator casing 12. The contacts 11 are embedded 1n an insulating member13 of ring formation which is secured in any ap- I proved manner to the inner Wall of the casing 12; v

The upper end of the bracket 1 is provided with a slot 14: adapted to receive a perforated projecting lug 15 secured to the cas 1 mg 12 which is adapted 'to'receive one'end: provision of a 'device for not only clam-ping of an operating lever for rocking the comt lie casing carrying the spaced contacts of I mutatorcasing. a

As shown more'particularly in Figure 3', thecom'muator casing 12 is inserted Within cylindrical "member '2' and rigidly? 18 with the split ends provided with lateral-' ly projecting perforated lugs 19 and 20.

The perforation of the lug 19 is provided with internal threads adapted to receive the threads of a screw 21 having a head 22 and operated by a sliding handle 23. When the screw is revolved lugs 19 will be drawn up rigidly clamped to the projecting end 16 of the casing 12. V p a The ring 17 is provided with converging arms 24 which are connected together by a bearing 25 for the shank ,26of a reamer 27. The reamer has cutting blades 28 on the enlarged head on the shank and the shank is slotted longitudinally at 33 and bored as shown' at 29 to receive a compression spring tight with the split ends of the ring being 30 and a rod 31 which has upon its outer end v a frusto-conically shaped member 32 for forcing the split sections 33 of the reamer apart when the nut 34 is drawn up upon the threaded end 35 of the rod 31. The screw engages the outer free end of the squared section 36 of the threaded end of the reamer. The compression spring 30 has one end in engagement with the inner face of the head 32 and its other end engaging the bottom of the bore 29. A disc 37 is placed in the bottom of the casing 12 and is engaged by the outer concave face'38 of the head 32 for maintaining the head in proper position upon the insulating ring 13 of the casing 12.

It will be noted that the reamer is split through thehead 39 with the slots extending to the inner end of the bore 29 so that when the head 32 is drawn inwardly of the bore 29 the reamer section will be readily forced outwardly and in close contact with the inner surface of the insulating ring 13 and contacts 11. a

After the casing 12 has been rigidly secured in the clamping member 2 and the split ring 17 has been clamped upon the pro- V jecting end 16 of the casing the nut 34isad justed for forcing the head 32 inwardly of the bore 29 and causing the blades 28 to rigidlyengage the inner circular face of the insulating member 13. A handle having: a

a square socket is laced upon the squared porprovide a true cylindrical surface for the tion 36 of the s iank of the reamer and re volves in a clockwise manner whereby the blade will cut awaythe insulating member 13 and thesurfaces of the contacts 11 and roller brush to revolve upon. a i a By my improved reamer the suriface of the contacts and the ring of insulating material 13 may be rte-surfaced as many times as may be desired which thereby eliminates the necessity of purchasing a new commutator each time it is found the contact surfaces areworn sufficiently to prevent proper ignition. a

What I claim is: i a

A device for reaming theinterior of a shell comprising a split ring adapted to re ceive the shell, means for clamping the ring to the shell, converging arms formed integrally with the ring and tern'iinating in a bearing sleeve coaxial with the ring, a

means on the reamer and plate for retaining the plate imposition in the shell.

JOHN LOCKEN. a

rea-me! positioned within the ring and i 

